i researched more on iCalendar and wanted to give you an update to some stuff i found, which i posted on the chronos-devel list already

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iCalendar is a very cool standard, chronos should definitely support it.
+++ Besides an iCalendar export function, it would be a great feature to be able to subscribe to iCalendar Streams, as it is possible with the Mozilla Calendar.
++ maybe reefknot is the key we are searching for: http://sourceforge.net/projects/reefknot/
"Reefknot is an attempt to create an iCal (RFC 2445) compliant toolkit in Perl. This toolkit will then be used to develop at least one server and one client as reference implementations."
the server could be used to make it possible for people to externally subscribe to a calendar stream; chronos could provide that -- for example for iCal (apple) or for the mozilla calendar-- see more info here http://icalshare.com/links.php

with the client, the chronos-users could subscribe to the provided public streams and have the web-calendar-streams in their private chronos-calendars. what do you think?
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and for all the debian users out there: i wrote an install guide for chronos on debian/woody